Pulleys



United States Patent-0 PULLEYS John Lord Arthur, Kent Town, SouthAustralia, Australia, assiguor to Pulleys (Aust.) Limited, Adelaide,South Australia, Australia, a corporation. of South Australia`ApplicationOctober 20,/1953, Serial No.,38.7,232 Claims priority,application Australia' December `1, 1952 4 Claims. ;(Cl.74-'230.8)

This vinvention relates to improvements -in and to pulleys and .inparticularit relates to pulleys .of rthe V groove type.

The .manufacturer fof V 4igroove ,pulleys ...usually pconsists in`casting or otherwise forming a pulley'inasuitable metal and -machiningthe grooves Ninto.same,although Iit has-heen proposed lheretofore toform thesespulleys iby pressing from sheet metal or the like andassembling the pressedpartsto form the pulleys.

According to one ofthe Jalready knownmethods teach pulley comprises ftwopressed steel members which :are solshayped that when they are :turned.to be assembled on a shaft about a vmedial 'line and screwed togethervthey ,are claimed to engage the shaft with a :driving tit.

It is the object of this invention, however-lto provide an improvedlform `of pulley of Vthis type in whicha inumber of advantages willbeattained such asian -Jelective driving .tit on 'the -shaft and .ifrequired the :provision zof different mountable lcentres .tto allow Vaipulleyito be tted to shafts-of different sizes.

.In brief the invention consists in Ethe use ofuat least twoside-,forming members ywhich 'are fpreferablyiiof `complementary shapeso that when ;they ;are\placed sin Aposition on a shaft .about `a medial.linedhey will Atonni the V groove for the belt, but instead of thesemembers directly engaging the shaft they are engaged on, or by, acompressible locking Vpiece which is so constructed that, when meansholding the side-forming vmembers,ofnthe pulley together are tightened,the locking xpiece willautomatically be rigidly engaged on ithe @shaftandgthe -side forming members of the pulley so that the pulleyis .thenrigidly locked to the shaft while the 1side-forming.smembersithereof arerigidly locked together.

In order, however, that the invention `'may be morefully understood it-will now be described with-:referenceutoithe accompanying drawings inwhich:

Fig. l is a side elevation of a pulley constructed according to ythisinvention,

lEig. 2 isjanexploded -end elevation of lsame-showing the Lparts that goto .make .up ythe pulley,

Fig. 3 is a section of same on line 3 3 of Fig. l,

Fig. 4 is a central transverse section corresponding to Fig. 3 butshowing a modilied form of pulley,

Fig. 5 shows a further modification of the pulley, and

Fig. 6 is a view corresponding to Fig. 3 but showing how multiplepulleys can be made up using the parts 0f this invention. p

Referring first to the pulley shown in Figs. l to 3, it will be seenthat this consists of a pair of disc-like sideforming members l and 2 ofidentical shape but in use placed back to back so that they form betweenthem a belt groove 3 and spaced apart central bosses d having a centralopening terminating in the edge 5.

Inserted between the central bosses 4 to engage the edge 5 is a lockingpiece 6 which has its two ends 7 chamfered so that these chaml'eredportions engage the edge 5 of the central boss 4. The locking piece 6 isprovided with a split S diametrically opposite a groove 9 fice g :lf itiisdesired ,to :provide 1a larger bearing surface 'on the shaft and alsoto utilise a set sorewUor-other'device to further secure the pulleytonthe shaft, lthe pulley may have ,a boss 14 securedonits oneside by setscrews -15 or Vthe like aslshown .in .Fig. 4 :of `:the drawings, awasher 16 'being used if such is desired so thatthe pulley is aligned on4theshaft by having thefaperture 17o`f the iboss 14 a sliding it on theshaftand .the aperture i8 of ythe washer .16 `also a sliding'iit ton theshaft. The central boss 4 is shown similar to that described withreference to .the foregoing embodiment and, in each of the `figures of'the -,drawings where similar parts appear, lthe same reference numeralsare 'used to lindicatesuch parts, the two side-:forming members 1 and 2between which the belt groove 3 is formed being similarfinthe embodimentshown in Lthis ligure 'to the side-form-ing members -of the previouslydescribed embodiment.

iln :the Lembodiment shown `in UFig. 5 the side-forming' members 1 andizare pulled together 'on -to .a modified form :ofnlocking piece 20g-thelocking piece Iin this case bein-'g extended beyond the chamferedportions 21 to form screw-threaded `,projections 22 on to zwhich nuts 23-are engaged, :the actionof 4the nuts 23 being `again to lforce theYbosses 4 of theside-'forming members 1 and 2 inwards on xto vthechamfers '21, which act-ion is also assisted-by the :nuts '23operatingonthefthreads due tothe-'angle of the threads-2te Aforce particularlythe outer Aedges of; the locking piece' 2@- down-Aonito' the shaft.lnthis case-to given- :uniform distribution ofj the locking eiectlthelockand three slots 25 on Vtheothers-ide. y

In the modification.fshown'infllig; 6in whichthe same partsare Ausedasin the mst-described)embodiment of the invention .excepting :that tthebolts -ltlhave'beenextended, thewsame `reference numerals are used as`in Figs. *1,1 2

and 3 Land the various parts *need Anol description linrit:

will #be seen-Sthatfthis lis merely a duplication of thefform being alsoused. It lwilli-be realised `that the number 'of grooves-scan libevaried -as it is -quite possible toamalreup multi-groove `pulleys infanynumber bysimp'ly Icontinuing to ibuilduon setssor =uriits-andito=pullythe'complete =as semblies together by passing bolts of sutlicientlength through all of the sections of the multiple groove pulley soformed. The one variation of this iigure `from that shown in Figs. l, 2and 3 is the inclusion of the washers 16 used in the embodiment shown inFig. 4 but the device may be used with or without these or could utilisea boss similar to the boss l-i which can have a grub screw or otherlocking means it such was felt to be desirable.

From the foregoing it will be appreciated that an irnproved pulley isprovided which can be read-ily formed by pressing or otherwise shapingidentical side-forming members which can be built up to form singlegroove pulleys or multi-groove pulleys without requiring a variation inshape and which are locked together by suitable means which also lockthem on to a locking piece which Iin turn locks the pulley on to ashlaft.

l claim:

1. A pulley assembly comprising a cylindrical core having right angularflat ends and chamfers on each end of the core and an axial bore ofapproximately the size of the shaft to which the core is to be applied,said core being provided with a radial slot extending all the waythrough from the bore to the periphery on one side of said core; adisc-like side plate mounted on each end of said core, each of said sideplates being provided with a central opening terminating in an edge andproviding edge contact between the plate and the chamfers of the core,said openings being of a diameter greater than the smaller diameter ofsa-id chamiers and -less than the larger diameter of said chamfers, saidplates being provided with a plurality of circumferentially spaced holesadjacent said openings extending axially therethrough and meansextending through said holes for drawing said plates together axially onsaid core whereby sa-id plates may be forced axially on said chamfers toclose said slot and lo'ck said core on a shat, the engagement of theopenings of said side plates with said chamfers providing a connectiontherebetween, said plates having cooperating structure adjacent theirperipheries to dene a V belt groove when assembled on said core.

f2. A pulley assembly compris-ing a cylindrical core having rightangular dat ends and chamfers on each end of the core and an axial boreof approximately the size of the shaft to which the core is to beapplied, said core being provided with a radial slot extending all theway through from the bore to the periphery on one side of said core; adisc-like side plate mounted on each end of said core, each of said sideplates being provided with a central opening terminating in an edge andproviding edge contact between the plate and the ychamlers of the core,said openings being of a diameter greater than the smaller diameter ofsaid cham'fers and less than the, larger diameter of said chamfers, saidplates being provided with a plurality of circumferentially spaced holesadjacent said openings extending axially therethrough and meansextending through said holes for drawing said plates together axially onsaid core whereby said plates may 4be forced axially on said chamfers toclose said slot and lock said core on a shaft, the engagement of theopenings of said side plates with said chamfers providing a connectiontherebetween, said plates having cooperating structure adjacent theirperiphenies to dettine a V belt groove when assembled on said core andto provide abutment means for spacing them axially on said core.

3. A pulley assembly comprising a cylindrical core having right angulardat ends and chamfers on each end of the core and an axial bore ofapproximately the size of the shaft to which the core is to be applied,said core being provided with a radial slot extending all the waythrough from the bore to the periphery on one side of said core; adiscdilre side plate mounted on each end of said core, each of said sideplates being provided with a central opening terminating in an edge andproviding edge contact between the plate and the chamfers of the core,said openings being of a diameter greater than the smaller diameter ofsaid chamfers and less than the larger diameter of said chamfers, andscrew threaded means mounted on said assembly for forcing said platestogether axially on said core whereby said plates may be forced axiallyon said chamfers to close said slot and lock said core on a shaft, theengagement of the openings of said side plates with said chamfersproviding a connection therebetween, said plates having cooperatingstructure adjacent their .peripheries to de'ne a V belt groove whenassembled on said core. l

4. A multiple pulley comprising a plurality of pulley assemblies mountedin end to end abutting relationship on a shaft, wherein each pulleyassembly comprises a cylindrical core having right angular flat ends andchamfers on each end of the core and an axial bore of approximately thesize of the shaft to which the core is to be applied, said core beingprovided with a radial slot extending all the way through from the boreto the periphery on one side of said core; a disc-like side platemounted on each end of said core, each of said side plates beingprovided with a central opening terminating in an edge and providingedge contact between the plate and the chamfers of the core, saidopenings being of a diameter greater than the smaller diameter of saidchamfers and less than the larger diameter of said chamfers, each ofsaid plates of the multiple pulley being provided with a plurality ofmating circumferentially spaced holes adjacent said openings extendingaxially therethrough and single bolt means extending through the matingholes of all the plates of the multiple pulley for drawing said platesof each -assembly together axially on said cores, whereby said platesmay be .forced axially on said chamfers to close each slot and lock eachcore on the shaft, the engagement of the openings of said side plateswith said -chamfers providing a connection therebetween, said plates ofeach assembly having cooperating structure adjacent their peripheries todeline a V belt groove when assembled on said core, and to provideabutment means for spacing them axially on said core, the abutment ofsaid .assemblies being at the portion adjacent said openings and theperipheral portions of said plates.

References Cited in the le of this patent UNITED STATES PATENTS 209,114?Taylor Oct. 22, 1878 $125,775 Wainwright Sept. lvl, 1'894 91,184,025*Rothenbucher May 23, 1916 !1,400,44J2 Kilcullen Dec. 13, 1921 1,562,937IBeardsley et al Nov. 2'4, 19,25 $2,326,866 Kincaid, Jr. Aug. 17, 19432,610,515 Williams Sept. 16, 1952 2,71l7,8l14 Archer Sept. 13, 1955FOREIGN PATENTS 622,461 Great Britain May 3, 1949 670,392` Great BritainApr. 16, 1952 97,8311' Austria Sept. 10, 1924

